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File:Graftonoceras fossil nautiloid (Lockport Dolomite, Middle Silurian; Coldwater, southern Mercer County, western Ohio, USA) (15054984258).jpg - Wikimedia Commons
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File:Sthenarocalymene celebra fossil trilobite (Cedarville Dolomite, Middle Silurian; Preble County, southwestern Ohio, USA) (15083687337).jpg - Wikimedia Commons
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